did you disconnect the battery recently or did it go dead if so there is an idle throttle position relearn procedure that you need to do othwrwise the throttle and idle will be wonky disconnect the battery for mins connect it back turn off all your accessories ac radio everything let it idle for minutes turn the car off turn it on this fixed it for me also check your tranny fluid if it is very dark grey color it needs to be change if it is low it needs some added